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SWT large component widget question [message #665018]

Tue, 12 April 2011 20:01

Eclipse User

Originally posted by: nospam.somewhere.org

A large swt widget component shall be implemented. A gantt diagram may
be an example for this component:

- a small part is visible, horizontal and vertical scrollbars are used
to scroll to currently invisible areas
- the number of horizontal and vertical elements is dynamic
- any (visible) element is choosable and shows a context menu

Simply implementing a paint listener may have poor performance if there
are many elements in the invisible are. Also the scrollbars shall
support smooth scrolling.

In which way can such component be implemented?

Markus

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Re: SWT large component widget question [message #665026 is a reply to message #665018]

Tue, 12 April 2011 22:03

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

Markus,

It sounds like something you might want to use GEF/Draw2D to implement.

Ceeper wrote:
> A large swt widget component shall be implemented. A gantt diagram may
> be an example for this component:
>
> - a small part is visible, horizontal and vertical scrollbars are used
> to scroll to currently invisible areas
> - the number of horizontal and vertical elements is dynamic
> - any (visible) element is choosable and shows a context menu
>
> Simply implementing a paint listener may have poor performance if
> there are many elements in the invisible are. Also the scrollbars
> shall support smooth scrolling.
>
> In which way can such component be implemented?
>
> Markus

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: SWT large component widget question [message #665051 is a reply to message #665018]

Wed, 13 April 2011 06:02

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

There's a gant control in Nebula.

Tom

Am 12.04.11 22:01, schrieb Ceeper:
> A large swt widget component shall be implemented. A gantt diagram may
> be an example for this component:
>
> - a small part is visible, horizontal and vertical scrollbars are used
> to scroll to currently invisible areas
> - the number of horizontal and vertical elements is dynamic
> - any (visible) element is choosable and shows a context menu
>
> Simply implementing a paint listener may have poor performance if there
> are many elements in the invisible are. Also the scrollbars shall
> support smooth scrolling.
>
> In which way can such component be implemented?
>
> Markus

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